35—50 kg黑头杜泊羊×小尾寒羊F1代杂交羊饲粮中适宜NFC/NDF比例研究

doi:10.3864/j.issn.0578-1752.2013.21.026

Abstract

Abstract: 【Objective】Dorper × Small Tail Han sheep crossbred lambs from 35 to 50 kg of live weight were used in a feeding trail, combined with in vitro gas production, to study proper dietary non-fiber carbohydrate to neutral detergent fiber(NFC/NDF) ratio.【Method】 Fifty female lambs and 25 male lambs were randomly assigned into five groups of ten female lambs and five male lambs each (five lambs/replication). Female and male lambs were separated in feeding. Each group was fed with one of the five diets which have the same crude protein level(11.90%) and different NFC/NDF ratios. The NFC/NDF ratios of the five diets were 1.36:1, 1.07:1, 0.82:1, 0.60:1, and 0.46:1，respectively. The experiment lasted for 56 d. Growth performance was measured, and a digestive trail was conducted after the sheep reached 50 kg of live weight. 【Result】 The in vitro gas production results showed as follows: As the dietary NFC/NDF ratio decreased, the gas production at 72 h, the ratio of gas production, in vitro digestibility of organic matter (IVDOM), total volatile fatty acids (TVFA),the ratios of propionate to butyrate were decreased significantly(P＜0.01), but the pH values of fermentation liquor, the ratio of acetate and acetate/propionate(A/P) were increased significantly(P＜0.01), the microbial crude protein(MCP) was higher than other groups when the NFC/NDF ratio was 0.82﹕1. The feeding trail results showed as follows: There were no significant effects of dietary NFC/NDF ratios on net body gains, average daily gains (P＞0.05) of the lambs; but gender of lambs played a significant role on this(P＜0.05). The order of body gains was 0.82＞1.36＞1.07＞0.60＞0.46 groups. Dry matter intake of the lambs had a positive correlation with dietary NFC/NDF ratios(R2=0.6573, P=0.0002), and showed a notable difference among five groups (P＜0.01), but dietary NFC/NDF ratios had no significant effects on feed conversion ratios (P＞0.05). NFC/NDF ratios had significant effects on apparent nutrient digestibility of dry matter, organic matter, crude protein, ether extract and fiber (P＜0.01), they were the highest in 0.82 group than in others. 【Conclusion】From the results of the experiment it is recommended that 0.82 is the proper dietary NFC/NDF ratio or 43.21% is the proper dietary NDF level for 35-50 kg Dorper × Small Tail Han sheep crossbred lambs while the dietary crude protein level is 11.90% and the NDF comes from Chinese wildrye and alfalfa hay.

Key words: crossbred lambs , NFC , NDF , dietary NFC/NDF ratios , TMR

ZHANG Li-Tao-1, WANG Jin-Wen-2, LI Yan-Ling-1, ZHANG Li-Xia-1, TU Yan-1, CUI Xu-Kui-2, MENG Xian-Feng-2, DIAO Qi-Yu-1. Research on Proper Dietary NFC/NDF Ratio for 35-50 kg Dorper × Small Tail Han Crossbred Lambs[J].Scientia Agricultura Sinica, 2013, 46(21): 4620-4632.

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Research on Proper Dietary NFC/NDF Ratio for 35-50 kg Dorper × Small Tail Han Crossbred Lambs

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